Imac monitor airplay on Apple tv

I have an iMac (21.5-inch, Late 2012), are few days i have problems with my airplay monitor in combo with apple tv, no longer gives the possibility of imac duplication but only the imac extension.
I do not have this problem with my macbook air and everything works.
any suggestions?
thanks!

OK, may be.
But I can find the AirPlay Logo from iMac and showing my Apple TV name.
If I not setup correctly, why my both MacBooks / iOS devices can AirPlay very well
After I selected the AirPlay from iMac, the TV just showing a "Black Screen" or nothing.

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